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Carbon dioxide + water glucose + oxygen
In a similar vein, Ana Damjanović was an undergraduate student in physics at Belgrade University when she met Schulten at a conference in Europe. Impressed by his research, she went to the University of Illinois at Urbana-Champaign specifically to get her PhD in Schulten's group. Shortly after her arrival, she would team up with Ritz and begin work on the quantum physics of photosynthesis.
The light-harvesting pigments are not only made of chlorophyll-like molecules that absorb sunlight. They also consist of carotenoids, which are pigments that also absorb light, usually in the blue range, and are popularly known for their nutritional value in foods such as tomatoes and sweet potatoes. The other main highlight of the collaboration between Damjanović and Ritz was clarification of the role that carotenoids play in light harvesting. Basically they found that the carotenoids have to use tricks in order to transfer the excitation to the chlorophylls.
Vacuole - containing cell sap to keep the cell turgid
But since plants don’t have parents (or kitchens), they have to make their own food. When plants make their own food, it is called photosynthesis.
Photosynthesis is a big word, isn’t it? It means light (photo) used to make something (synthesis). Hhmmm…can you guess how plants make their food?
If you guessed the sun, you are right! Here’s how it works…
Light energy is absorbed by the green chemical chlorophyll. This energy allows the production of glucose by the reaction between carbon dioxide and water. Oxygen is also produced as a waste product.
Cell wall - strengthens the cell
Strümpfer and Schulten found that within a ring complex, coherence plays an important role; but the hopping from one ring to another, for example from one LH2 to a different LH2, is much easier to visualize and compute. Excitation hops from one ring to another, and its mathematics is given by probabilities, but the excitation is never in both rings at the same time. “So that makes it easier, first, to imagine, and then second, to actually model physically,” remarks Strümpfer.
One of the major questions people have asked Schulten and Strümpfer about this work is how does quantum coherence then play a role in light harvesting. And Strümpfer calls the answer one of the most surprising findings to come out of their comprehensive study. “The effect is that having quantum coherence within one ring dramatically improves the rate at which excitation can jump from one ring to the next ring,” he summarizes.
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Put down that pen and listen to some additional Science audio.
In this study of carotenoids, a trip to Japan for an unrelated reason rekindled Schulten's interest in his Harvard work from the early 1970s on polyenes. Carotenoids are related to polyenes, as both share an underlying structure of conjugated double bonds, and both polyenes and carotenoids have low-lying, optically forbidden states. While Schulten was in Japan in the late 1990s for a conference on visual receptors, he met Yasushi Koyama, an experimentalist who had studied the forbidden states in polyenes. Koyama was keen to collaborate with Schulten and, in order to get to know him better, asked Schulten if he would like to take a drive to an earthquake museum. The Kobe earthquake rocked Japan in 1995, and a memorial museum commemorated the devastation.
The cell walls of a plant have two main jobs:
In the 1940s Arnold and Oppenheimer had wondered why so many chlorophylls were necessary in photosynthesis and exactly how they all worked together. In the late 1990s, Schulten together with Hu, Ritz and Damjanović elucidated the physics underlying the structures of the light-harvesting proteins, namely that the arrangement of a group of tightly-interacting chlorophylls in fact act together to make themselves more efficient through quantum coherence.
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During the trip to the earthquake museum, Koyama revealed he was aware of the work Schulten and Karplus did in the early 1970s to prove that polyenes had optically forbidden states, and that he was very eager to team up with Schulten's group for a paper. Schulten and Koyama, together with the team of Ritz and Damjanović, elaborated on the mechanism that made carotenoids sometimes couple efficiently to chlorophylls to transfer excitation when the coupling was expected to be poor. They suggested in a 2000 paper that some photosynthetic systems have a type of symmetry breaking in their carotenoids that augments the excitation transfer efficiency.
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One of the first things the trio would immediately uncover was how quantum coherence assists light harvesting. In the two light-harvesting proteins, LH1 and LH2, chlorophyll-like molecules (technically called bacteriochlorophylls in purple bacteria) are packed closely together in a ring shape, as seen in the picture of LH2 for example. To transfer the energy harvested by the chlorophylls, the individual chlorophylls team up and transfer the excitation not randomly but in a pool. They share their excitation in a very ordered, or so to speak, “coherent” way; it is as though they are humming one tune together as opposed to each playing unique parts in an orchestra. With quantum coherence, the system of pigments could reach very far and fast to transfer the excitation.
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